How to upgrade from os x 10.6/10.7 to mountain lion 10.8

Operating Systems

Today morning i was very happy when i saw a news that Apple has finally rolled Mountain Lion today. I was waiting for the same since they announced the operating system. Well, now what i want to know is how much is it going to cost me and what are the system requirements for the same. It will be really very appreciated if you guys can also give a short tutorial about how can i upgrade my system to 10.8 Mountain lion. At present am running with Snow leopard 10.7 on Macbook. Thanks in advance.

Upgrading process to Mountain Lion is very simple. If you are currently having Snow Leopard 10.7.xx or Lion than your system will work comfortably with Mountain Lion. In order to upgrade you just need to click on Apple logo in the menu bar and click on Software Update. Your system will show you the update as Mountain Lion 10.8, click on it and simply follow the onscreen commands. Or alternatively launch Mac App Store, search for Mountain Lion. Click on Upgrade. Thats it.

Clear the payment stuffs (hope you know it will cost you $19.99) and your system will be running with Mountain Lion in next few minutes. There are also some criteria Where you can get the 10.8 update for free.

Well that seems to be quite simple and easy process for upgrading to Mountain Lion. Anyways, am here to confirm one thing. Is Apple giving this upgrade for free also ? I heard it somwehere there few people can get the upgrade without paying a single dollar. How is that possible ? I guess there should be any condition for the same. If it is possible please let me know the requirements.